Carburetor for internal-combustion engines



March 11, 1930. H. wEsLAKE CARBURETOR FOR INTERNAL GOMBUSTION ENGINES Filed Sept.. 19.. 1925 In ventor l/t/MAU .f

Patented Mar. 11, 1930 UNITED STATES HENRY WESLAKE, OF LONDON, ENGLAND CABBUBETOR FOR INTERNAL-COMBUSTION ENGINES Application filed September 19, 1925, Serial No. 57,406, and in Great Britain August 4, 19tl5, I

This invention relates to carburetors for internal combustion engines, and especially to carburetors in which the mixing or choke tube is horizontally disposed. The invention has among its objects to render the operat-ion of] the engine most eicient v at determined Spee The invention comprises the features hereinafter described.

The invention is hereinafter described by way of example with reference to the accompanying diagrammatic drawing in which Figure 1 is a sectional elevation of a carburetor provided according to the invention,

Figure 2 is a part sectional .plan view corresponding to Figure 1,

Figures 3 and 4 are detail views of the nozzle in plan and sectional elevation respecv tively, and

, elevation and plan respectively of a modified construction of nozzle.

In carrying the invention intoy eiiect aocording to one construction and with refer.

ence to Figures 1 to 4 of the accompanying drawing I provide the mixing or choke tube a horizontally disposed with one end advantageously outwardly flaring, while the other is adapted for connection by suitable means to the induction pipe.

The ioat chamber b is dispqsed in such position in relation to the iat nozzle c that the normal level of liquid in the float chamber is immediately below the central plane of the nozzle. The float chamber b is adapted for connection beneath the mixing or choke tube a, and for this purpose the tube a may be provided with a downwardly extending boss fitting a1, having at its upper end a recess adapted for the reception of the enlarged lower end c2 of the tubular stem c", by which the nozzle o is supported in a horizontal position within the mixing tube, and through which the volatile liquid may pass through to the central cavity 01 in the nozzle c. The iioat chamber b is provided at 'its lower end 'with an outwardly extending arm b1 in which a channel b2 is provided for the outward pas sage of the volatile liquid, and at the end of the arm, a tubular boss b3 is provided adapt- Figures 5 and 6 are detail views in sectionall ed for insertion within the downwardly extending boss fittin a1, and the tubular boss i b may be adapted or the reception of a plug d having an axial bore hole, which plug is sc rew threaded externally for engagement with an internal screw thread at the enlarged lower end c2 of the tubular stem 0 by which the nozzle c is supported; and at the ,lower end the plug d may be provided with an external annular groove d1, and a transverse hole d2, whereby the volatile liquid flowing from the channel b2 into the annular space surrounding the plug at the position at which the groove d1 is provided, may pass through the transverse hole d2 into and through the 65 axial bore hole in the plug d and thence through to the nozzle c.

The mixing or choke tube a may be provided with a transversely disposed throttle valve e adjacent the front of the nozzle c, which valve may be adapted to slide so' as partially or wholly to close the mixing or choke tube a, and so as also partially or wholly to close the nozzle orice c3. For this purpose the front of the nozzle o is straight, and lies adjacent tothe valve e. The valvev e may be provided as a hollow cylinder closed at its outer end, and may be mounted within a transversely disposed part a2 of the mixing or choke tube a of a corresponding form, eo and it may be Subj ect to the action of a helical spring e1 tending normally to close it, 'and it may be operable by means` of a 130W-, den transmission wire e2, the operating lever of which may be adapted to be set into determined positlons. Thus on being so set the cross sectional area of the mixing tube a may be varied by the valve as vwell as the outlet oriicec3 of the nozzle c.

vThe nozzle c may be provided advantageously of two parts, that is to say, a lower or base part c* and-a top part or cover plate c5. The lower or base part c* may be provided with a recessed or dished Central part, the sides of which are inclined inwardly towards therear, whereby on the top art or cover plate c5 being applied in positionthe cavity c1 is formed which is gradually reduced in width towards the rear, where the inlet for volatile liquid is provided through 10o the tubular stem c", by which the nozzle c is supported as hereinbeforedescribed. At the front a narrow outlet orifice c3 is provided which for example may be of about 8/1000ths of an inch wide and about 1/8 of an inch in depth, while the width of the cavity c1 :formed within the nozzle c as described, may be for example about 40/1000ths of an inch.

' A series of holes c7 or a slot or slots may be provided over the narrow or contracted part of the nozzle c, and the series of holes c7, or the slot or slots may be interrupted as and for the purpose hereinbefore described,l or certain'of the holes may be closed by plugs of suitable form.

In Figure 3 the positions of the series of holes are shown interrupted at the left, so that thus a richer mixture may be provided on the valve being fully o ened. It will however be understood that t e interruption may occur at the middle of the nozzle or at the opposite side, and that the sizes of the holes `ma be varied in particular positions.

ccording to a modified construction of the nozzle as illustrated in` Figures 5 and 6,

the nozzle is provided in two separate parts 08, c", disposed in adjacent positions, each part being formed of a lower or base part c* and a top part or cover plate 05, and being provided with a stem 0, central cavity c1 and oriice c3 as hereinbefore described. In this construction however the series of holes cT or a slot or slots are provided only in one part cB of the nozzle; or the series of holes or the slot or slots may be provided in each nozzle an'd may be interrupted for the purposes hereinbefore described.

The mixing or choke tube a may be provided at the rear of a rectangular transverse cross section, comprising parallel vertically disposed Walls as, and parallel horizontally disposed walls a4 which latter flare outwardly at the rear. The upper horizontal wall a* at its outwardly or upwardly flaring rear end has hinged to it at the outer edge a movable wall a of an outwardly flaring shape, similar to that of the oppositely disposed wall, but so disposed that its inner end a extends to a position adjacent the throttle valve e or the front of the nozzle c. The movable wall a thus provided extends completely across from one vertical wall a5 to the' other and in one position it may lie adjacent the upper wall a* of the mixing tube a, while in the other its inner end a may lie in position adjacent the top face of the nozzle c. B such means the mixing or choke tube a in position above the nozzle c may be adjusted in cross sectional area to the extent desired. The movable wall a5 may thus by means of a Bowden transmission wire al, the central part of which is connected to its inner end, be caused to assume any desired position between the; extreme positions indicated.

The apparatus described is of general ap- -the valve; thus for exam le the face of the plication, but is especially applicable to motor-cycles. It will be understood that any type of throttle valve-other than indicated may be used, but that the edge of the nozzle may be formed to correspond to the face of valve and lthe edge of t e nozzle may be strai ht or convex or concave. Double or multiple nozzles such as described with reference to Figures 5 and 6 are more especially intended to use with carburetors for motoi` vehicles and any one or more of the nozzles may have the series of holes or slots interrupted, or the holes or slots of varying diameter or width. The nozzle or nozzles may be reduced at the front where the top and bottom faces may be inclined inwards towards the outlet oriiice, and this is in general preere'd Where the utmost efiiciency is desired.

I claim 1. A carburetor comprising in combination a mixing tube substantially horizontally disposed, a transversely disposed throttle valve provided in the said mixing tube, a nozzle disposed within the said mixing tube said nozzle being substantially horizontally disposed with its outlet end adjacent the periphery of the said throttle valve, in a plane parallel with the axis of the said throttle valve, said nozzle being adapted for the passage through it of the volatile liquid fuel, and having at its upper part adjacent its outlet end only air admission apertures which extend towithin the interior of the said nozzle adjacent the outlet end, substantially as described.

2. A carburetor comprising in combination a mixing tube substantially horizontally disposed, a transversely disposed throttle valve provided in the said mixing tube, a nozzle disposed within the said mixing tube said nozzle being substantially horizontally disposed With its outlet end adjacent the periphery of the said throttle valve, in a plane parallel with the axis of the said throttle valve, said nozzle being adapted for the passage through it o"f the volatile liquid fuel, and having at its upper part adjacent its outlet end only air admission apertures which extend to within the interior of the nozzle adjacent the outlet end, said apertures not extending completely across the top of the nozzle, substantially as described.

3. A carburetor comprising in combination a mixing tube substantially horizontally dis- Y posed, a transversely disposed t-hrottle valve with the axis of the said throttle valve, said nozzle being adapted for the passage through it of the volatile liquid fuel, and having at lts upper part adjacent its outlet end only air 13o admission apertures which extend to within the interior of the nozzle adjacent the outlet end, said apertures being of variable dimensions, substantially as described.

4. A carburetor comprising in combination a mixing tube substantially horizontally disposed, a transversely disposed throttle valve provided in the said mixing tube, a plurality of independent iiat nozzles disposed within the said mixing tube, said flat nozzles being substantially horizontally disposed with their respective outlet ends adjacent the periphery of the said throttle valve, in' a plane parallel with the axis of the said throttle valve, said flat nozzles being adapted for the passage through them of thevolatile liquid fuel, one or more of said flat nozzles having air admission apertures formed on their upper parts which apertures extend to Within the interior of the respective nozzle adjacent the outlet end only, substantially as described.

5. A carburetor comprising incombination a mixing tube substantially horizontally disposed, a transversely disposed throttle valve provided in the said mixingtube, a flat nozzle disposed within the said mixing tube,said nozzle being substantially horizontally disposed with its outlet end adjacent the periphery of the said throttle valve, in a plane parallel with the axis of the said throttle valve, a valve Within the mixing tube land disposed inposition above the said nozzle, the said valve being hinged near the inlet end of the mixing tube away from the throttle valve and being adapted to be lowered on its hinge to vary the cross-sectional area of the tube above the nozzle and between the said nozzle and the upper part of the said mixing tube only, and mechanical means for the manual operation of the said hinged valve, substantially as described.

HENRY WESLAKE. 

